They called and leftr a very pointless message..it was nothing but air..What are they and why are they callin

This number called me and when i picked up the phone to answer he/she refused to talk and hung up on me but when i called i was told that i just entered the number that is not in use.

Called again, at 9:41am today.  The Caller ID box intercepted the call and life is good.

I got a missed call from the same number. When I googled, I found this forum. Thought of sharing with others who are in the same boat.

Claimed to be 'James' from Forde Home Service offering duct cleaning services.  When I asked questions about the 'offer' he hung up on me.  Why is this sort of call ok?

It's a company called BBM Analysis. Looking to survey television and radio trends. How they got my cell is beyond me.